import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:getx_scaffold/getx_scaffold.dart';
import 'package:image/image.dart' as img;
import 'package:image_picker/image_picker.dart';
import 'package:qr_code_scanner_plus/qr_code_scanner_plus.dart';
import 'package:zxing_lib/common.dart';
import 'package:zxing_lib/qrcode.dart';
import 'package:zxing_lib/zxing.dart';

class QrCodeController extends GetxController
    with BaseControllerMixin, GetSingleTickerProviderStateMixin {
  @override
  String get builderId => 'qrcode';

  // --- Animation ---
  late final AnimationController animationController;
  late final Animation<double> scanAnimation;

  // --- QR Scanning ---
  final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
  QRViewController? qrViewController;
  final Rx<Barcode?> result = Rx<Barcode?>(null);
  final RxBool isFlashOn = false.obs;

  @override
  void onInit() {
    super.onInit();
    requestPermission();

    animationController = AnimationController(
      duration: const Duration(milliseconds: 2500),
      vsync: this,
    );
    scanAnimation = Tween<double>(begin: 0, end: 1).animate(animationController);
    animationController.repeat(reverse: false);
  }

  /// 当 QRView 创建时调用
  void onQRViewCreated(QRViewController controller) {
    this.qrViewController = controller;
    // 监听扫描到的数据
    controller.scannedDataStream.listen((scanData) {
      if (scanData.code != null && result.value?.code != scanData.code) {
        result.value = scanData;
        qrViewController?.pauseCamera();

        animationController.stop();

        renderResult(scanData.code!);
      }
    });
  }

  void resumeScanner() {
    result.value = null;
    qrViewController?.resumeCamera();
    animationController.repeat(reverse: false);
  }

  /// 从相册选择图片并扫描二维码
  void scanFromGallery() async {
    try {
      final XFile? imageFile = await ImagePicker().pickImage(source: ImageSource.gallery);
      if (imageFile == null) return; // 用户取消了选择

      qrViewController?.pauseCamera();
      animationController.stop();

      String? scanResult;
      try {
        final image = img.decodeImage(await File(imageFile.path).readAsBytes());
        if (image != null) {
          //扫描图片
          final pixels = Int32List.fromList(
            image.map((pixel) {
              return (pixel.a.toInt() << 24) |
                  (pixel.r.toInt() << 16) |
                  (pixel.g.toInt() << 8) |
                  pixel.b.toInt();
            }).toList(),
          );

          final source = RGBLuminanceSource(image.width, image.height, pixels);

          final bitmap = BinaryBitmap(HybridBinarizer(source));
          final reader = QRCodeReader();
          final result = reader.decode(bitmap);
          scanResult = result.text;
        }
      } on NotFoundException {
        scanResult = null;
      } catch (e) {
        //异常
        scanResult = null;
      }

      if (scanResult != null) {
        renderResult(scanResult);
      } else {
        showErrorToast('未识别到二维码');
        resumeScanner();
      }
    } catch (e) {
      showErrorToast('从相册选择失败');
      resumeScanner();
    }
  }

  /// 切换闪光灯
  void toggleFlash() async {
    await qrViewController?.toggleFlash();
    isFlashOn.value = (await qrViewController?.getFlashStatus()) ?? false;
  }

  /// 翻转相机
  void flipCamera() async {
    await qrViewController?.flipCamera();
  }

  void requestPermission() async {
    final List<bool> results = await Future.wait([
      requestCameraPermission(),
      requestPhotosPermission(),
    ]);

    final isCameraGranted = results[0];
    final isPhotosGranted = results[1];

    if (!isCameraGranted) {
      showErrorToast('相机权限未被授予，请到权限管理中打开');
    }
    if (!isPhotosGranted) {
      showErrorToast(
        '相册权限未被授予，请到权限管理中打开',
      );
    }
  }

  //扫码结果处理
  void renderResult(String resultStr) {
    Get.defaultDialog(
      title: "扫描结果",
      middleText: resultStr,
      onConfirm: () {
        Get.back();
        resumeScanner();
      },
      onCancel: () {
        resumeScanner();
      },
    );

  }

  @override
  void onClose() {
    qrViewController?.dispose();
    animationController.dispose();
    super.onClose();
  }
}